@InProceedings{EspinosaSarmientoPadiSilv:2018:EsAmGe,
               author = "Espinosa Sarmiento, Karen Viviana and Padilha, Ant{\^o}nio Lopes 
                         and Silva, Ligia Alves da",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Estimate of the amplitude of geomagnetically induced currents 
                         (gic) at different places in brazil duringmagnetic storms occurred 
                         in the year 2015",
                 year = "2018",
         organization = "Latin American Conference on Space Geophysics, 11. (COLAGE)",
             abstract = "Geomagnetic induced currents (GIC) detected on the Earths surface 
                         are related to extreme solar events and may represent a signicant 
                         danger to technological systems installed both in space and in the 
                         ground. Its eects are relatively well studied in auroral and 
                         midlatitude regions, but there are still few studies in low 
                         latitudes and near the magnetic equator. To evaluate its eects in 
                         the low latitude region of South America and thus contribute to 
                         the development of new mechanisms that may help to minimize its 
                         possible impact, the intensity of the GIC in four locations in the 
                         Brazilian territory is here evaluated during four geomagnetic 
                         storms that occurred during the year 2015. Geomagnetic eld 
                         variation data recorded by uxgate magnetometers of the Brazilian 
                         Space Weather program at INPE (EMBRACE) are available during these 
                         storms. Using information from the electrical conductivity 
                         distribution below each magnetic station, geoelectric eld 
                         variations were derived for the period of the magnetic storms. 
                         Subsequently, GIC values were estimated using the Lehtinen-Pirjola 
                         (LP) engineering model and available information from a 500 kV 
                         transmission grid located in Central Brazil (around the Furnas 
                         substation node in Itumbiara, State of Goias ). After validating 
                         the numerical calculations comparing with the GIC data measured at 
                         this substation, the electric power transmission grid at Itumbiara 
                         was hypothetically shifted to the stations where measurements of 
                         the geomagnetic eld are available. The maximum GIC amplitude 
                         estimated by the LP model was about 8A during the main phase of a 
                         magnetic storm on June 21 (Dst = -204 nT) at a station in the 
                         center-west Brazil. Although this station is aected by the diurnal 
                         currents of the equatorial electrojet, the comparison with the 
                         other storms showed that, besides the large dH/dt of this storm, 
                         the main responsible for the GIC is the high resistivity of the 
                         rocks below this station.",
  conference-location = "Buenos Aires, Argentina",
      conference-year = "16-20 abr.",
             language = "en",
        urlaccessdate = "28 abr. 2024"
}